Počet záznamů: 1
Observations of Electromagnetic Ion Cyclotron (EMIC) Waves with Rising Tones During a Van Allen Probes Conjunction
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SYSNO ASEP 0518079 Druh ASEP A - Abstrakt Zařazení RIV Záznam nebyl označen do RIV Zařazení RIV Není vybrán druh dokumentu Název Observations of Electromagnetic Ion Cyclotron (EMIC) Waves with Rising Tones During a Van Allen Probes Conjunction Tvůrce(i) Sigsbee, K. (US)
Kletzing, C. (US)
Faden, J. (US)
Jaynes, A.N. (US)
Geoffrey, R. (US)
Jahn, J. (US)
Santolík, Ondřej (UFA-U) RID, ORCIDCelkový počet autorů 7 Zdroj.dok. AGU Fall Meeting. - Washington : American Geophysical Union, 2019
SM23C-3221Poč.str. 1 s. Forma vydání Online - E Akce AGU Fall Meeting 2019 Datum konání 09.12.2019 - 13.12.2019 Místo konání San Francisco Země US - Spojené státy americké Typ akce WRD Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova magnetosphere ; geomagnetic storm ; electromagnetic ion cyclotron (EMIC) waves ; coronal mass ejections (CMEs) ; solar wind ; Van Allen Probes Vědní obor RIV BL - Fyzika plazmatu a výboje v plynech Obor OECD Fluids and plasma physics (including surface physics) Institucionální podpora UFA-U - RVO:68378289 Anotace We will present simultaneous Van Allen Probes observations of electromagnetic ion cyclotron (EMIC) waves associated with enhanced solar wind dynamic pressure from the recovery phase of a geomagnetic storm driven by coronal mass ejections (CMEs) in December 2015. Both of the Van Allen Probes observed H+ band EMIC waves with similar spatial structures and amplitudes of a few nT during a close conjunction in the dayside magnetosphere. The EMIC waves were observed just outside the plasmasphere, within a few degrees magnetic latitude of the equatorial plane. On the outbound halves of the spacecraft orbits, the EMIC waves were observed beween 10-11 MLT in a narrow L shell region from 4.6-5.3 RE. On the inbound halves of the spacecraft orbits, the EMIC waves were observed between 13-14 MLT between L shells of 4.8-5.1 RE. The EMIC waves were associated with strong anisotropy of the proton pitch angle distributions above the Alfvén energy, which was likely caused by the high solar wind dynamic pressure and injections of ions above 10 keV. The global radiation belt response during this storm appears to have been the result of acceleration and transport processes. However, the EMIC waves still produced local pitch angle scattering of 10-15 keV protons and 2.1-2.6 MeV electrons. The EMIC waves observed by the Van Allen Probes included rising tones, which are sometimes called triggered emissions. EMIC waves with rising tones are thought to be more effective at scattering protons and electrons than unstructured EMIC waves. We will present wave normal analysis of the EMIC waves observed by both spacecraft and discuss the frequency sweep rates of the rising tones. Pracoviště Ústav fyziky atmosféry Kontakt Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Rok sběru 2020
Počet záznamů: 1